I agree people won't think Eren will die. In the manga it still felt like they might kill him. He still felt like just one player in a larger conflict. He could die in a sudden twist as part of the world building. It would just show how grim the fight with the titans was.
But the chronological ordering meant a bit more time following Eren's character. So he's more of a main character who won't be killed off. And there's the OP too.